round? Does this sea-snake match its wonderful nimbleness of body with an equally wonderful nimbleness of brain? I do not presume to theorise on such a conundrum of Nature, but mention an undoubted fact for others to ponder.

One of the salt sea snakes is distinguished by its odd, deceptive shape--a broad, flattened tail whence the body consistently diminishes to the head, which is the thinnest part. Other aquatic snakes have paddle-shaped tails.

Another singular denizen of the reef is a species of Acrozoanthus (?)--a compound animal having a single body and several heads. The body is contained in a perpendicular, parchment-like, splay-footed tube a foot and a half or two feet long, whence the heads obtrude alternately as buds along a growing branch. Many of the tubes are vacant--the skeletons of the departed. From those which are occupied the heads appear as bosses of polished malachite veined and fringed with dusky purple, and yellow-centred.

SPAWN OF THE SEA

"The dewdrop slips into the shining sea."

So Edwin Arnold. Here is an observation illustrating the manner in which certain pellucid sea-drops materialise and ultimately shed themselves as living organisms "into the shining sea."

On November 6, 1908, the sea tossed up on the beach an exceptionally large and absolutely perfect specimen of the egg-cluster of that spacious and useful mollusc known as the Bailer Shell (MELO DIADEMA or CYMBIUM FLAMMEUM). Its measurements were: length, 16¼ in.; circumference at base, 12¾ in.; at middle, 11¼ in.; at apex 7 1/8 in. It weighed 1¾ lb. and comprised 126 distinct capsules. The photograph presents a candid likeness.

During the same month and the first two weeks of December portions of several other egg-clusters came ashore, and as they were in nicely graduated stages of development I was enabled to indulge in an exceptionally entertaining study--no less than the observation of the transformation of glistening fluid into solid matter and life. In passing it may be mentioned that the first and the last two months of the year appear to constitute the period when the offspring of the species see the light of day, proving that the natural impulses of some molluscs are subject to rule and regulation similarly to those of birds and other terrestrial forms.

Each of the capsules composing the cluster is a cone with the apex free and interior, while the base is external and adherent to its immediate neighbours, but not completely so throughout its circumference. It follows, therefore, that the cluster of capsules is hollow and that water flushes it throughout. In appearance it resembles a combination of the pineapple and the corncob, and to the base a portion of the coral-stem to which it had been anchored by its considerate parent was firmly attached.

When the cluster of capsules (the substance of which is tough, semi-transparent, gelatine, opal-tinted, soon to be sea-stained a yellowish green) is slowly expelled from the parent's body--I have been witness to the birth--each contains about one-sixth ounce of vital element, fluid and glistening. Physical changes in this protoplasm manifest themselves in the course of a few days. The central portion becomes a little less fluid, and from an inchoate blur a resemblance to a diaphanous shell develops and floats, cloud-like, in a perfectly limpid atmosphere. Gradually it becomes denser though still translucent, as it seemingly absorbs some of the fluid by which it is surrounded. The model of the future animal, exact even to the dainty contours and furrows around that which represents the spire of the ultimate shell, is still without trace of visible organs. That, however, its substance is highly complex is obvious, for as imperceptible development progresses the exterior is transformed into a substance resembling rice tissue-paper--an infinitely fragile covering--which from day to day insensibly toughens in texture and becomes separate from the animal. Faint opaque, transverse ribs are at this stage apparent, though disappearing later on. Opacity is primarily manifested at the aperture of the infant mollusc where a seeming resemblance to an operculum forms, possibly for the protection of vital organs during nascency. This plaque of frail armour is, however, soon dismantled, and of course much more happens in the never-ceasing process than is revealed to the uninitiated.

As the calcareous envelope becomes opaque and solid, the animal within loses its transparent delicacy, and coincidentally the apex of the capsule opens slightly. In the meantime the fluid contents have disappeared, as if the animal had resulted from its solidification. The animal, too, is a very easy fit in its compartment, and incapable, in its extreme fragility of withstanding the pressure of a finger. Now it begins to increase rapidly in bulk and sturdiness; the shell becomes hard, and as the exit widens it screws its way out of a very ragged cradle, emerging sound and whole as a bee from its cell, all its organs equipped to ply their respective offices.

With pardonable affectation of vanity it has finally fitted itself for appearance in public by the assumption of three or four buff and brown decorations upon its milk-white shell, which quickly blend into a pattern varying in individuals, of blotches and clouds in brown, yellow, and white. In maturity the mollusc weighs several pounds, its shell has a capacity for as much as two gallons of water, and is coloured uniformly buff, while in old age infantile milk-white reasserts itself.

It is not for such as I am in respect of the teachings of science to say whether the development of the perfect animal from a few drops of translucent jelly--as free from earthly leaven as a dewdrop--is to be more distinctly traced, in the case of this huge mollusc than in other elementary forms. All that it becomes an unversed student of life's mysteries to suggest is that this example gives bold advertisement to the marvellous process.

Many of the secrets of life are written in script so cryptic and obscure that none but the wise and greatly skilled may decipher it, and they only, when aided by the special equipment which science supplies. In this case the firm but facile miracle is recorded in words that he that runs may read. Independent of microscope the unskilled observer may trace continuity in the transformation of jelly to life.

The sea-drop, lovely in its purity, knowing neither blemish nor flaw, becomes an animal with form and features distinctive from all others, with all essential organs, means of locomotion, its appetite, its dislikes, its care of itself, its love for its kind, its inherent malice towards its enemies--all evolved in a brief period from the concentrated essence of life.

"If, as is believed, the development of the perfect animal from protoplasm epitomises the series of changes which represent the successive forms through which its ancestors passed in the process of evolution" (these are the words of Professor Francis Darwin) what a graphic, what a luminous demonstration of evolution is here presented!

In a brief previous reference to this mollusc it was stated that the infants in their separate capsules were in a state of progressive development from the base to the apex of the cluster, those in the base being the farther advanced. Investigations lead to a revision of such statement. No favour seems to be enjoyed by first-born capsules. Development is equable and orderly, but as in other forms of life the contents of certain capsules seem to start into being with a more vigorous initial impulse than others, and these mature the more speedily. A sturdy infant may be screwing its way out of its cradle, while in a weakly and degenerate brother alongside the thrills of life may be far less imperative.

The pictures illustrate isolated scenes in the life-history of the mollusc, which in a certain sense offers a solution to, the conundrum stated by job "Who, hath begotten the drops of dew?"

PROTECTIVE COLORATION

July 17, 1909.

Found a small cowry shell of remarkable beauty on dead coral in the Bay. At first sight it appeared as a brilliant scarlet boss on the brown coral, and upon touching it the mantle slowly parted and was withdrawn, revealing a shell of lavender in two shades in irregular bands and irregularly dotted with reddish brown spots; the apertures were richly stained with orange, and the whole enamel exceedingly lustrous. Most of the molluscs of the species conceal themselves under mantles so closely resembling their environments as to often render them invisible. In this case the disguise assumed similitude to a most conspicuous but common object of anomalous growth, seeming to be a combination of slime and sponge.

CHAPTER XIV

SOME CURIOUS BIVALVES

Though certain species of molluscs have their respective habitats, and that which is considered rare in one part may be common in another, there are few which have not a general interest for the scientific conchologist. Collectors prize shells on account of their rarity and beauty; the man of science because of the assistance they afford in the working out of the universal problems of nature. Neither a collector nor a scientific student, my attitude towards marine objects is that of a mere observer--an interested and often wonder-struck observer--so that when I classify one species of mollusc as common and another as rare I am judging them in accordance with my own environment and information, not from a general knowledge of one of the most entertaining branches of natural history. From this standpoint I may refer to four or five species which stand out from the rest in interest and comparative rarity.

An oyster (OSTREA DENDOSTREA FOLIUM), too mean of proportions, too dull and commonplace of colour to be termed pretty, worth nothing, and justifying, in appearances its worthlessness, is remarkable for the exercise of a certain sort of deliberate wit in accordance with special conditions. Nature provides various species of the great oyster family with respective methods of holding their own in the sea, and in the case under review she permits the individual to exercise a choice of two different methods of fixture as chance and the drift of circumstances decide its location. From the bases of the valves spring three or more pairs of hook-like processes which, if Fate decides upon a certain coral host, encircle a slim "twig," creating for the mollusc a curious resemblance to a short-limbed sloth hugging tightly the branch of a tree. When the spat happens to settle in places where coral is not available the hooks or arms are but crudely developed. It becomes a club-footed cripple, its feet adherent by agglutination or fusion to a rock or other